What you are asking is not trivial at all, and using the CSS direction attribute will not help, per se.

As you are using a built-in region type, there is a lot of page orientation HTML code that is hard-coded, including JavaScript function parameters, which set to Left (e.g. dhtml_MenuOpen). Another problem is the hard-coded use of the arrow images (e.g. menu_open_right2.gif). These images are not influenced by the CSS direction attribute, and need to be replaced with images in a reverse direction.

To make a long story short – what you are asking can't be done out-of-the-box, or by minor changes to CSS files.

Regards,
Arie.

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